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JP7565263B2 - Liquefied gas storage structure and liquefied gas carrier - Google Patents
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JP7565263B2 - Liquefied gas storage structure and liquefied gas carrier - Google Patents

Liquefied gas storage structure and liquefied gas carrier Download PDF

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Publication number
JP7565263B2
JP7565263B2 JP2021511073A JP2021511073A JP7565263B2 JP 7565263 B2 JP7565263 B2 JP 7565263B2 JP 2021511073 A JP2021511073 A JP 2021511073A JP 2021511073 A JP2021511073 A JP 2021511073A JP 7565263 B2 JP7565263 B2 JP 7565263B2
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tank
support member
liquefied gas
outer tank
inner tank
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JPWO2020202577A1 (en
Inventor
英樹 川本
達也 今井
啓介 間城
健太郎 奥村
遼平 藤村
一雄 田中
大輔 神▲崎▼
洋輝 中土
治 村岸
好伸 坂野
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Kawasaki Motors Ltd
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Kawasaki Jukogyo KK
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0128—Shape spherical or elliptical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/012—Reinforcing means on or in the wall, e.g. ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0308—Radiation shield
    • F17C2203/032—Multi-sheet layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F17C2203/0333—Polyurethane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0345—Fibres
    • F17C2203/035—Glass wool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0391—Thermal insulations by vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/0192—Details of mounting arrangements with external bearing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

本発明は、液化ガス貯留構造およびこれを含む液化ガス運搬船に関する。 The present invention relates to a liquefied gas storage structure and a liquefied gas carrier including the same.

従来から、ＬＮＧや液化水素などの液化ガスを貯留するタンクが知られている。例えば、特許文献１には、液化水素を貯留する球形のタンクが船体に搭載された液化水素運搬船が開示されている。Tanks for storing liquefied gases such as LNG and liquefied hydrogen have been known for some time. For example, Patent Document 1 discloses a liquefied hydrogen carrier having a spherical tank for storing liquefied hydrogen mounted on the hull.

この液化水素運搬船では、船体の床面から立ち上がる筒状のスカートによってタンクが支持されている。また、タンクの外側面は全面的に絶縁層で覆われている。In this liquefied hydrogen carrier, the tanks are supported by a cylindrical skirt that rises from the floor of the hull, and the entire outer surface of the tanks is covered with an insulating layer.

特表２０１９－５０１０６４号公報Special table 2019-501064 publication

しかしながら、特許文献１に開示された液化水素運搬船では、床面からスカートを通じたタンク内への熱侵入が大きいという問題がある。However, the liquefied hydrogen carrier disclosed in Patent Document 1 has the problem that a large amount of heat enters the tank from the floor through the skirt.

そこで、本発明は、床面からタンク内への熱侵入を低減することができる液化ガス貯留構造、およびこれを含む液化ガス運搬船を提供することを目的とする。Therefore, the present invention aims to provide a liquefied gas storage structure that can reduce heat intrusion into the tank from the floor surface, and a liquefied gas carrier including the same.

前記課題を解決するために、本発明の１つの側面からの液化ガス貯留構造は、液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、床面から立ち上がって前記外槽を支持する第１支持部材と、前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する第２支持部材と、を備える、ことを特徴とする。 In order to solve the above problem, a liquefied gas storage structure from one aspect of the present invention is characterized by comprising a double-shell tank including a spherical inner tank for storing liquefied gas and an outer tank that houses the inner tank, a first support member that rises from the floor surface and supports the outer tank, and a second support member that rises from the inner side surface of the outer tank at a position different from the first support member and supports the inner tank.

また、本発明の液化ガス運搬船は、船体と、液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、前記船体の床面から立ち上がって前記外槽を支持する第１支持部材と、前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する第２支持部材と、を備える、ことを特徴とする。 The liquefied gas carrier of the present invention is characterized in that it comprises a hull, a double-hull tank including a spherical inner tank for storing liquefied gas and an outer tank for accommodating the inner tank, a first support member rising from the floor of the hull and supporting the outer tank, and a second support member rising from the inner surface of the outer tank at a position different from the first support member and supporting the inner tank.

上記の構成によれば、床面から内槽までの熱侵入経路は、第１支持部材、外槽における第１支持部材と第２支持部材の間の部分、第２支持部材となる。従って、外槽に沿った第１支持部材と第２支持部材の離間距離分、熱侵入経路の長さを確保できる。これにより、床面から二重殻タンク内への熱侵入を低減することができる。 According to the above configuration, the heat intrusion path from the floor surface to the inner tank is the first support member, the portion between the first support member and the second support member in the outer tank, and the second support member. Therefore, the length of the heat intrusion path can be secured by the distance between the first support member and the second support member along the outer tank. This can reduce heat intrusion from the floor surface into the double-shell tank.

例えば、前記外槽は球形であり、前記第２支持部材は、前記内槽に接合された筒状のスカートであり、前記第１支持部材は、前記外槽に接合された筒状のスカートであってもよい。For example, the outer tank may be spherical, the second support member may be a cylindrical skirt joined to the inner tank, and the first support member may be a cylindrical skirt joined to the outer tank.

前記第２支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含んでもよい。この構成によれば、第２支持部材を内槽および外槽へ容易に接合することができるとともに、第２支持部材の中間部により第２支持部材を通じた熱伝導を阻害することができる。The second support member may include an upper portion made of the same material as the inner tank, a lower portion made of the same material as the outer tank, and an intermediate portion made of a material having a lower thermal conductivity than the inner tank and the outer tank. With this configuration, the second support member can be easily joined to the inner tank and the outer tank, and the intermediate portion of the second support member can inhibit heat conduction through the second support member.

例えば、前記内槽および前記第２支持部材の上部の材質と、前記外槽および前記第２支持部材の下部の材質は同じであってもよい。For example, the material of the inner tank and the upper part of the second support member may be the same as the material of the lower part of the outer tank and the second support member.

上下方向において、前記第２支持部材の前記上部および前記下部のそれぞれの長さは、前記中間部の長さよりも短くてもよい。この構成によれば、上部、中間部および下部の長さが同じである場合に比べて、二重殻タンク内への熱侵入をより低減することができる。In the vertical direction, the length of each of the upper and lower parts of the second support member may be shorter than the length of the middle part. With this configuration, it is possible to further reduce heat penetration into the double-shell tank compared to when the lengths of the upper, middle and lower parts are the same.

前記床面は船体の床面であり、前記第１支持部材は、前記外槽と同じ材質の上部と、前記船体と同じ材質の下部と、前記外槽および前記船体よりも熱伝導率の低い材質の中間部を含んでもよい。この構成によれば、第１支持部材を外槽および船体へ容易に接合することができるとともに、第１支持部材の中間部により第１支持部材を通じた熱伝導を阻害することができる。The floor surface may be the floor surface of the hull, and the first support member may include an upper portion made of the same material as the outer tank, a lower portion made of the same material as the hull, and an intermediate portion made of a material having a lower thermal conductivity than the outer tank and the hull. With this configuration, the first support member can be easily joined to the outer tank and the hull, and the intermediate portion of the first support member can inhibit heat conduction through the first support member.

前記内槽と前記外槽の間の空間には前記液化ガスが気化したボイルオフガスが充填されていてもよい。内槽と外槽の間の空間に気体が充填されている場合には、内槽に貯留されている液化ガスの温度によっては内槽と外槽の間で気体が液化または固化する可能性があるが、その気体がボイルオフガスであれば内槽と外槽の間での気体の液化または固化を防ぐことができる。The space between the inner tank and the outer tank may be filled with boil-off gas produced by vaporizing the liquefied gas. If the space between the inner tank and the outer tank is filled with gas, the gas may liquefy or solidify between the inner tank and the outer tank depending on the temperature of the liquefied gas stored in the inner tank. However, if the gas is boil-off gas, the liquefaction or solidification of the gas between the inner tank and the outer tank can be prevented.

例えば、上記の液化ガス貯留構造は、前記内槽と前記外槽の間の空間に詰め込まれて、前記内槽の外側面および前記外槽の内側面を覆う断熱材をさらに備えてもよい。For example, the above-mentioned liquefied gas storage structure may further include an insulating material packed into the space between the inner tank and the outer tank and covering the outer surface of the inner tank and the inner surface of the outer tank.

上記の液化ガス貯留構造は、前記外槽の外側面を覆う断熱材をさらに備えてもよい。この構成によれば、外槽の外側面が断熱材で覆われていない場合に比べて、内槽から外槽までの距離、換言すれば外槽の直径を小さくすることができる。The liquefied gas storage structure may further include a heat insulating material covering the outer surface of the outer tank. With this configuration, the distance from the inner tank to the outer tank, in other words, the diameter of the outer tank, can be made smaller than when the outer surface of the outer tank is not covered with a heat insulating material.

また、本発明の別の側面からの液化ガス貯留構造は、液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、前記外槽の内側面から立ち上がって前記内槽を支持する支持部材と、を備え、前記支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含む、ことを特徴とする。 In addition, a liquefied gas storage structure from another aspect of the present invention comprises a double-shell tank including a spherical inner tank for storing liquefied gas and an outer tank that houses the inner tank, and a support member that rises from the inner side of the outer tank and supports the inner tank, wherein the support member includes an upper portion made of the same material as the inner tank, a lower portion made of the same material as the outer tank, and an intermediate portion made of a material having a lower thermal conductivity than the inner tank and the outer tank.

上記の構成によれば、支持部材を内槽および外槽へ容易に接合することができる。しかも、支持部材の中間部により支持部材を通じた熱伝導を阻害することができるので、二重殻タンク内への熱侵入を低減することができる。 With the above configuration, the support member can be easily joined to the inner and outer tanks. Moreover, the middle part of the support member can inhibit heat conduction through the support member, thereby reducing heat penetration into the double-shell tank.

例えば、前記内槽および前記支持部材の上部の材質と、前記外槽および前記支持部材の下部の材質は同じであってもよい。For example, the material of the inner tank and the upper part of the support member may be the same as the material of the outer tank and the lower part of the support member.

本発明によれば、床面から二重殻タンク内への熱侵入を低減することができる。 According to the present invention, it is possible to reduce heat intrusion into a double-shell tank from the floor surface.

本発明の一実施形態に係る液化ガス貯留構造を含む液化ガス運搬船の断面図である。1 is a cross-sectional view of a liquefied gas carrier including a liquefied gas storage structure according to one embodiment of the present invention. 図１の一部の拡大図である。FIG. 2 is an enlarged view of a portion of FIG. 変形例の液化ガス貯留構造を含む液化ガス運搬船の断面図である。A cross-sectional view of a liquefied gas carrier including a modified liquefied gas storage structure. 別の変形例の液化ガス貯留構造を含む液化ガス運搬船の断面図である。A cross-sectional view of a liquefied gas carrier including a liquefied gas storage structure of another modified example.

図１に、本発明の一実施形態に係る液化ガス貯留構造を含む液化ガス運搬船１を示す。この液化ガス運搬船１は、船体１１と、船体１１に搭載された二重殻タンク２と、船体１１と共に二重殻タンク２の周囲に保持空間１３を形成するタンクカバー１２を含む。1 shows a liquefied gas carrier 1 including a liquefied gas storage structure according to one embodiment of the present invention. The liquefied gas carrier 1 includes a hull 11, a double-hull tank 2 mounted on the hull 11, and a tank cover 12 which, together with the hull 11, forms a holding space 13 around the double-hull tank 2.

本実施形態では、保持空間１３に窒素ガスが充填される。ただし、保持空間１３には、乾燥空気が充填されてもよいし、推進用エンジンの排気ガスが充填されてもよい。In this embodiment, the holding space 13 is filled with nitrogen gas. However, the holding space 13 may also be filled with dry air or exhaust gas from a propulsion engine.

二重殻タンク２は、液化ガスを貯留する内槽３と、内槽３を収容する外槽４を含む。例えば、液化ガスは、ＬＮＧ、液化窒素、液化水素、液化ヘリウムなどである。The double-shell tank 2 includes an inner tank 3 for storing liquefied gas and an outer tank 4 for housing the inner tank 3. For example, the liquefied gas may be LNG, liquefied nitrogen, liquefied hydrogen, liquefied helium, etc.

内槽３は、球形である。内槽３は、必ずしも球対称である必要はなく、球対称に近似する形状であってもよい。例えば、内槽３は、球対称に比べて、内槽３の中心から上４５度の角度方向および／または下４５度の角度方向が膨らんだ形状であってもよい。あるいは、内槽３は、上半球体と下半球体との間に短い筒状体が挟まれた形状であってもよい。The inner tank 3 is spherical. The inner tank 3 does not necessarily have to be spherically symmetrical, and may have a shape that approximates spherical symmetry. For example, the inner tank 3 may have a shape that is bulging at an angle of 45 degrees above and/or below the center of the inner tank 3 compared to spherical symmetry. Alternatively, the inner tank 3 may have a shape in which a short cylindrical body is sandwiched between an upper hemisphere and a lower hemisphere.

本実施形態では、外槽４も球形である。外槽４の中心は内槽３の中心と一致している。内槽３と同様に、外槽４も、必ずしも球対称である必要はなく、球対称に近似する形状であってもよい。例えば、外槽４は、内槽３と同様に、球対称に比べて、外槽４の中心から上４５度の角度方向および／または下４５度の角度方向が膨らんだ形状であってもよい。あるいは、外槽４は、上半球体と下半球体との間に短い筒状体が挟まれた形状であってもよい。In this embodiment, the outer tank 4 is also spherical. The center of the outer tank 4 coincides with the center of the inner tank 3. Like the inner tank 3, the outer tank 4 does not necessarily have to be spherically symmetrical, and may have a shape that approximates spherical symmetry. For example, like the inner tank 3, the outer tank 4 may have a shape that is bulged 45 degrees above and/or below the center of the outer tank 4 compared to spherical symmetry. Alternatively, the outer tank 4 may have a shape in which a short cylindrical body is sandwiched between an upper hemisphere and a lower hemisphere.

本実施形態では、外槽４の材質が内槽３の材質と同じである。ただし、外槽４の材質は内槽３の材質と異なってもよい。In this embodiment, the material of the outer tank 4 is the same as the material of the inner tank 3. However, the material of the outer tank 4 may be different from the material of the inner tank 3.

内槽３と外槽４の間の空間には第１断熱材７が詰め込まれている。第１断熱材７は、外槽４の内側面および内槽３の外側面を全面的に覆う。さらに、外槽４の外側面は、第２断熱材８により全面的に覆われている。The space between the inner tank 3 and the outer tank 4 is filled with a first insulating material 7. The first insulating material 7 completely covers the inner surface of the outer tank 4 and the outer surface of the inner tank 3. Furthermore, the outer surface of the outer tank 4 is completely covered with a second insulating material 8.

第１断熱材７は、例えば、ポリウレタン（ＰＵ）やフェノール樹脂（ＰＦ）などの樹脂からなる発泡体であってもよいし、パーライトやガラス中空体などの粒状体であってもよいし、グラスウールなどの無機繊維であってもよい。The first insulating material 7 may be, for example, a foam made of a resin such as polyurethane (PU) or phenolic resin (PF), a granular material such as perlite or hollow glass, or an inorganic fiber such as glass wool.

第２断熱材８は、例えば、ポリウレタンやフェノール樹脂などの樹脂からなる発泡体である。上述したように保持空間１３には窒素ガスが充填されるため、第２断熱材８が発泡体である場合は、保持空間１３から窒素ガスが第２断熱材８内に侵入し、第２断熱材８内の空隙が窒素ガスで充填される。また、ガス発生装置（図示せず）から第２断熱材８に窒素ガスを供給してもよい。なお、保持空間１３に乾燥空気が充填される場合は、第２断熱材８内の空隙にも乾燥空気が充填されてもよい。The second insulating material 8 is, for example, a foam made of a resin such as polyurethane or phenolic resin. Since the holding space 13 is filled with nitrogen gas as described above, when the second insulating material 8 is a foam, nitrogen gas enters the second insulating material 8 from the holding space 13, and the voids in the second insulating material 8 are filled with nitrogen gas. Nitrogen gas may also be supplied to the second insulating material 8 from a gas generator (not shown). When the holding space 13 is filled with dry air, the voids in the second insulating material 8 may also be filled with dry air.

本実施形態では、内槽３と外槽４の間の空間に内槽３内の液化ガスが気化したボイルオフガスが充填されている。ただし、内槽３と外槽４の間の空間には、内槽３内の液化ガスの温度では液化しないその他のガスが充填されてもよい。あるいは、内槽３と外槽４の間の空間は真空であってもよい。In this embodiment, the space between the inner tank 3 and the outer tank 4 is filled with boil-off gas produced by vaporizing the liquefied gas in the inner tank 3. However, the space between the inner tank 3 and the outer tank 4 may be filled with other gases that do not liquefy at the temperature of the liquefied gas in the inner tank 3. Alternatively, the space between the inner tank 3 and the outer tank 4 may be a vacuum.

内槽３と外槽４の間の空間にボイルオフガスを充填する方法としては種々の方法が採用可能である。例えば、内槽３の上部に連通穴を設けてもよい。あるいは、図示は省略するが、内槽３からボイルオフガスを他の機器へ導く移送管に分岐管を設け、この分岐管の先端を内槽３と外槽４の間で開口させてもよい。Various methods can be used to fill the space between the inner tank 3 and the outer tank 4 with boil-off gas. For example, a communication hole may be provided at the top of the inner tank 3. Alternatively, although not shown, a branch pipe may be provided in the transfer pipe that leads the boil-off gas from the inner tank 3 to other equipment, and the tip of this branch pipe may be opened between the inner tank 3 and the outer tank 4.

船体１１の床面１１ａと外槽４との間には第１支持部材６が配置されており、外槽４と内槽３との間には第２支持部材５が配置されている。第１支持部材６は、床面１１ａから立ち上がって外槽４を支持し、第２支持部材５は、第１支持部材６と異なる位置で外槽４の内側面から立ち上がって内槽３を支持する。A first support member 6 is disposed between the floor surface 11a of the hull 11 and the outer tank 4, and a second support member 5 is disposed between the outer tank 4 and the inner tank 3. The first support member 6 rises from the floor surface 11a to support the outer tank 4, and the second support member 5 rises from the inner surface of the outer tank 4 at a position different from the first support member 6 to support the inner tank 3.

本実施形態では、第１支持部材６および第２支持部材５が共に鉛直方向を軸方向とする筒状のスカートである。第１支持部材６の上端は、外槽４の赤道部（外槽４の鉛直中心線から最も遠くに位置する最大径部分）に接合されている。同様に、第２支持部材５の上端は、内槽３の赤道部（内槽３の鉛直中心線から最も遠くに位置する最大径部分）に接合されている。In this embodiment, the first support member 6 and the second support member 5 are both cylindrical skirts with the vertical direction as their axial direction. The upper end of the first support member 6 is joined to the equator portion of the outer tank 4 (the maximum diameter portion located farthest from the vertical center line of the outer tank 4). Similarly, the upper end of the second support member 5 is joined to the equator portion of the inner tank 3 (the maximum diameter portion located farthest from the vertical center line of the inner tank 3).

図２に示すように、第１支持部材６は、上部６１、中間部６２および下部６３を含む。図例では、上下方向において、上部６１、中間部６２および下部６３の長さが同じになっているが、それらの長さは適宜変更可能である。As shown in Figure 2, the first support member 6 includes an upper portion 61, a middle portion 62, and a lower portion 63. In the illustrated example, the upper portion 61, the middle portion 62, and the lower portion 63 have the same length in the vertical direction, but these lengths can be changed as appropriate.

上部６１は、外槽４と同じ材質（例えば、アルミニウム）で構成され、下部６３は、船体１１と同じ材質（例えば、炭素鋼）で構成される。中間部６２は、外槽４および船体１１よりも熱伝導率の低い材質（例えば、ステンレス鋼）で構成される。図示は省略するが、上部６１と中間部６２の間および中間部６２と下部６３の間には異材継手が設けられる。ただし、中間部６２は、船体１１と同じ材質で構成されてもよいし、外槽４と同じ材質で構成されてもよい。The upper part 61 is made of the same material as the outer tank 4 (e.g., aluminum), and the lower part 63 is made of the same material as the hull 11 (e.g., carbon steel). The middle part 62 is made of a material with a lower thermal conductivity than the outer tank 4 and the hull 11 (e.g., stainless steel). Although not shown, dissimilar material joints are provided between the upper part 61 and the middle part 62 and between the middle part 62 and the lower part 63. However, the middle part 62 may be made of the same material as the hull 11 or the outer tank 4.

同様に、第２支持部材５は、上部５１、中間部５２および下部５３を含む。図例では、上下方向において、上部５１および下部５３のそれぞれの長さが中間部５２の長さよりも短くなっているが、それらの長さは適宜変更可能である。Similarly, the second support member 5 includes an upper portion 51, an intermediate portion 52, and a lower portion 53. In the illustrated example, the length of each of the upper portion 51 and the lower portion 53 is shorter than the length of the intermediate portion 52 in the vertical direction, but these lengths can be changed as appropriate.

上部５１は、内槽３と同じ材質（例えば、アルミニウム）で構成され、下部５３は、外槽４と同じ材質（上述した通り、例えば、アルミニウム）で構成される。中間部５２は、内槽３および外槽４よりも熱伝導率の低い材質（例えば、ステンレス鋼）で構成される。図示は省略するが、上部５１と中間部５２の間および中間部５２と下部５３の間には異材継手が設けられる。ただし、第２支持部材５は、上部５１、中間部５２および下部５３が一体化され、上部５１から下部５３まで熱伝導性の低い材質（例えば、ステンレス鋼）で構成されてもよい。The upper part 51 is made of the same material as the inner tank 3 (e.g., aluminum), and the lower part 53 is made of the same material as the outer tank 4 (e.g., aluminum, as described above). The middle part 52 is made of a material with a lower thermal conductivity than the inner tank 3 and the outer tank 4 (e.g., stainless steel). Although not shown, dissimilar material joints are provided between the upper part 51 and the middle part 52 and between the middle part 52 and the lower part 53. However, the second support member 5 may be made of a material with low thermal conductivity (e.g., stainless steel) from the upper part 51 to the lower part 53, with the upper part 51, the middle part 52, and the lower part 53 integrated.

以上説明したように、本実施形態の液化ガス貯留構造では、床面１１ａから内槽３までの熱侵入経路は、第１支持部材６、外槽４における第１支持部材６と第２支持部材５の間の部分、第２支持部材５となる。従って、外槽４に沿った第１支持部材６と第２支持部材５の離間距離分、熱侵入経路の長さを確保できる。これにより、床面１１ａから二重殻タンク２内への熱侵入を低減することができる。As explained above, in the liquefied gas storage structure of this embodiment, the heat intrusion path from the floor surface 11a to the inner tank 3 is the first support member 6, the portion between the first support member 6 and the second support member 5 in the outer tank 4, and the second support member 5. Therefore, the length of the heat intrusion path can be secured to be equal to the separation distance between the first support member 6 and the second support member 5 along the outer tank 4. This makes it possible to reduce heat intrusion from the floor surface 11a into the double-shell tank 2.

また、本実施形態では、第２支持部材５の上部５１および下部５３がそれぞれ内槽３および外槽４と同じ材質で構成されているので、第２支持部材５を内槽３および外槽４へ容易に接合することができる。しかも、第２支持部材５の中間部５２は上部５１および下部５３よりも熱伝導率が低いので、その中間部５２により第２支持部材５を通じた熱伝導を阻害することができる。In addition, in this embodiment, the upper portion 51 and the lower portion 53 of the second support member 5 are made of the same material as the inner tank 3 and the outer tank 4, respectively, so that the second support member 5 can be easily joined to the inner tank 3 and the outer tank 4. Moreover, the middle portion 52 of the second support member 5 has a lower thermal conductivity than the upper portion 51 and the lower portion 53, so that the middle portion 52 can inhibit heat conduction through the second support member 5.

しかも、本実施形態では、第２支持部材５の上部５１および下部５３のそれぞれの長さが中間部５２の長さよりも短くなっているので、上部５１、中間部５２および下部５３の長さが同じである場合に比べて、二重殻タンク２内への熱侵入をより低減することができる。Moreover, in this embodiment, the length of each of the upper portion 51 and lower portion 53 of the second support member 5 is shorter than the length of the middle portion 52, so that the intrusion of heat into the double-shell tank 2 can be further reduced compared to when the lengths of the upper portion 51, middle portion 52 and lower portion 53 are the same.

さらに、本実施形態では、第１支持部材６の上部６１および下部６３がそれぞれ外槽４および船体１１と同じ材質で構成されているので、第１支持部材６を外槽４および船体１１へ容易に接合することができる。しかも、第１支持部材６の中間部６２は上部６１および下部６３よりも熱伝導率が低いので、その中間部６２により第１支持部材６を通じた熱伝導を阻害することができる。Furthermore, in this embodiment, the upper portion 61 and the lower portion 63 of the first support member 6 are made of the same material as the outer tank 4 and the hull 11, respectively, so that the first support member 6 can be easily joined to the outer tank 4 and the hull 11. Moreover, the middle portion 62 of the first support member 6 has a lower thermal conductivity than the upper portion 61 and the lower portion 63, so that the middle portion 62 can inhibit heat conduction through the first support member 6.

また、本実施形態では、内槽３と外槽４の間の空間にボイルオフガスが充填されている。内槽３と外槽４の間の空間に気体が充填されている場合には、内槽３に貯留されている液化ガスの温度によっては内槽３と外槽４の間で気体が液化または固化する可能性があるが、本実施形態のようにその気体がボイルオフガスであれば内槽３と外槽４の間での気体の液化または固化を防ぐことができる。In addition, in this embodiment, the space between the inner tank 3 and the outer tank 4 is filled with boil-off gas. If the space between the inner tank 3 and the outer tank 4 is filled with gas, the gas may liquefy or solidify between the inner tank 3 and the outer tank 4 depending on the temperature of the liquefied gas stored in the inner tank 3. However, if the gas is boil-off gas as in this embodiment, the liquefaction or solidification of the gas between the inner tank 3 and the outer tank 4 can be prevented.

（変形例）
本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変形が可能である。 (Modification)
The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

例えば、本発明の液化ガス貯留構造は、必ずしも液化ガス運搬船１に含まれる必要はなく、陸上設備に含まれてもよい。すなわち、第１支持部材６が立ち上がる床面は地上面であってもよい。For example, the liquefied gas storage structure of the present invention does not necessarily have to be included in the liquefied gas carrier 1, but may be included in a land facility. In other words, the floor surface from which the first support member 6 stands may be the ground surface.

また、内槽３と外槽４の間の空間には、必ずしも第１断熱材７が詰め込まれている必要はない。例えば、内槽３と外槽４の間の空間が真空である場合は、内槽３の外側面のみが、輻射シールドフィルムとスペーサが交互に積層された積層真空断熱材で覆われてもよい。In addition, the space between the inner tank 3 and the outer tank 4 does not necessarily need to be filled with the first insulation material 7. For example, if the space between the inner tank 3 and the outer tank 4 is a vacuum, only the outer surface of the inner tank 3 may be covered with a laminated vacuum insulation material in which radiation shielding films and spacers are alternately laminated.

さらに、外槽４の外側面は必ずしも第２断熱材８で覆われている必要はなく、図３に示すように露出していてもよい。しかし、この場合には、内槽３から外槽４までの距離を大きくして断熱性能を確保する必要がある。これに対し、前記実施形態のように外槽４の外側面が第２断熱材８で覆われていれば、外槽４の外側面が第２断熱材８で覆われていない場合に比べて、内槽３から外槽４までの距離、換言すれば外槽４の直径を小さくすることができる。 Furthermore, the outer surface of the outer tank 4 does not necessarily need to be covered with the second insulating material 8, and may be exposed as shown in Figure 3. In this case, however, it is necessary to increase the distance from the inner tank 3 to the outer tank 4 to ensure thermal insulation performance. In contrast, if the outer surface of the outer tank 4 is covered with the second insulating material 8 as in the above embodiment, the distance from the inner tank 3 to the outer tank 4, in other words the diameter of the outer tank 4, can be made smaller than when the outer surface of the outer tank 4 is not covered with the second insulating material 8.

また、外槽４は、必ずしも球形である必要はなく、例えば、図４に示すような形状であってもよい。 Furthermore, the outer tank 4 does not necessarily have to be spherical and may have a shape, for example, as shown in Figure 4.

また、第１支持部材６および第２支持部材５は必ずしも筒状のスカートである必要はない。例えば、第１支持部材６および第２支持部材５のそれぞれは、複数の支柱で構成されてもよい。この場合、第１支持部材６および第２支持部材５が同一円周上に位置し、第１支持部材６を構成する支柱と第２支持部材５を構成する支柱とが周方向に交互に配置されてもよい。In addition, the first support member 6 and the second support member 5 do not necessarily have to be cylindrical skirts. For example, each of the first support member 6 and the second support member 5 may be composed of multiple pillars. In this case, the first support member 6 and the second support member 5 may be located on the same circumference, and the pillars constituting the first support member 6 and the pillars constituting the second support member 5 may be arranged alternately in the circumferential direction.

１ 液化ガス運搬船
１１ 船体
１１ａ 床面
２ 二重殻タンク
３ 内槽
４ 外槽
５ 第２支持部材
５１ 上部
５２ 中間部
５３ 下部
６ 第１支持部材
６１ 上部
６２ 中間部
６３ 下部
７，８ 断熱材 Reference Signs List 1 Liquefied gas carrier 11 Hull 11a Floor surface 2 Double-shell tank 3 Inner tank 4 Outer tank 5 Second support member 51 Upper portion 52 Middle portion 53 Lower portion 6 First support member 61 Upper portion 62 Middle portion 63 Lower portion 7, 8 Thermal insulation material

Claims (10)

液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、
船体の床面から立ち上がって前記外槽を支持する、筒状のスカートである第１支持部材と、
前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する、前記第１支持部材と直径が異なる筒状のスカートである第２支持部材と、を備え、
前記第１支持部材は、前記内槽、前記第２支持部材および前記外槽の荷重を受ける、液化ガス貯留構造。 A double-shell tank including a spherical inner tank for storing liquefied gas and an outer tank for accommodating the inner tank;
a first support member which is a cylindrical skirt rising from the floor surface of the hull and supporting the outer tank;
a second support member which is a cylindrical skirt having a different diameter from that of the first support member and which stands up from the inner surface of the outer tank at a position different from that of the first support member to support the inner tank ;
A liquefied gas storage structure , wherein the first support member supports the load of the inner tank, the second support member, and the outer tank . 前記外槽は球形であり、
前記第２支持部材は、前記内槽に接合され、
前記第１支持部材は、前記外槽に接合されている、請求項１に記載の液化ガス貯留構造。 The outer vessel is spherical;
The second support member is joined to the inner tank,
The liquefied gas storage structure according to claim 1 , wherein the first support member is joined to the outer tank. 前記第２支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含む、請求項１または２に記載の液化ガス貯留構造。 The liquefied gas storage structure according to claim 1 or 2, wherein the second support member includes an upper portion made of the same material as the inner tank, a lower portion made of the same material as the outer tank, and an intermediate portion made of a material having a lower thermal conductivity than the inner tank and the outer tank. 前記内槽および前記第２支持部材の上部の材質と、前記外槽および前記第２支持部材の下部の材質は同じである、請求項３に記載の液化ガス貯留構造。 The liquefied gas storage structure according to claim 3, wherein the material of the inner tank and the upper part of the second support member is the same as the material of the outer tank and the lower part of the second support member. 上下方向において、前記第２支持部材の前記上部および前記下部のそれぞれの長さは、前記中間部の長さよりも短い、請求項３または４に記載の液化ガス貯留構造。 The liquefied gas storage structure according to claim 3 or 4, wherein the length of each of the upper and lower parts of the second support member in the vertical direction is shorter than the length of the middle part. 前記第１支持部材は、前記外槽と同じ材質の上部と、前記船体と同じ材質の下部と、前記外槽および前記船体よりも熱伝導率の低い材質の中間部を含む、請求項１～５の何れか一項に記載の液化ガス貯留構造。 The liquefied gas storage structure according to any one of claims 1 to 5, wherein the first support member includes an upper portion made of the same material as the outer tank, a lower portion made of the same material as the hull, and an intermediate portion made of a material having a lower thermal conductivity than the outer tank and the hull. 前記内槽と前記外槽の間の空間には前記液化ガスが気化したボイルオフガスが充填されている、請求項１～６の何れか一項に記載の液化ガス貯留構造。 The liquefied gas storage structure according to any one of claims 1 to 6, wherein the space between the inner tank and the outer tank is filled with boil-off gas produced by vaporizing the liquefied gas. 前記内槽と前記外槽の間の空間に詰め込まれて、前記内槽の外側面および前記外槽の内側面を覆う断熱材をさらに備える、請求項１～７の何れか一項に記載の液化ガス貯留構造。 The liquefied gas storage structure according to any one of claims 1 to 7, further comprising a heat insulating material packed in the space between the inner tank and the outer tank and covering the outer surface of the inner tank and the inner surface of the outer tank. 前記外槽の外側面を覆う断熱材をさらに備える、請求項１～８の何れか一項に記載の液化ガス貯留構造。 The liquefied gas storage structure according to any one of claims 1 to 8, further comprising a heat insulating material covering the outer surface of the outer tank. 船体と、
液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、
前記船体の床面から立ち上がって前記外槽を支持する、筒状のスカートである第１支持部材と、
前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する、前記第１支持部材と直径が異なる筒状のスカートである第２支持部材と、を備え、
前記第１支持部材は、前記内槽、前記第２支持部材および前記外槽の荷重を受ける、液化ガス運搬船。
 The hull and
A double-shell tank including a spherical inner tank for storing liquefied gas and an outer tank for accommodating the inner tank;
A first support member which is a cylindrical skirt rising from the floor surface of the hull and supporting the outer tank;
a second support member which is a cylindrical skirt having a different diameter from that of the first support member and which stands up from the inner surface of the outer tank at a position different from that of the first support member to support the inner tank ;
A liquefied gas carrier , wherein the first support member supports the load of the inner tank, the second support member, and the outer tank .
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